Pion production and absorption in relativistic nucleus-nucleus collisions
- GSI Planckstr.1, Darmstadt (Germany)
In a relativistic nucleus-nucleus collision the projectile kinetic energy is not only converted into thermal and compressional energy of the nucleonic system, but also into internal excitation energy of the nucleons. At bombarding energies around 1 GeV/nucleon a substantial amount of baryonic resonances is produced which decay predominantly into pions. Thus the pion multiplicity, momentum and angular distributions provide information on the space time dynamics of the nuclear reaction system. In this paper the authors report on experiments which try to measure the `primordial` delta or pion abundancy. The idea is to compare the pion yields measured in a heavy and a light system: in the first case pion final-state interactions should happen much more frequently than in the second case. Both inclusive pion cross sections and pion multiplicities per participant nucleon are measured. In addition the authors study the pion emission pattern with respect to the reaction plane to sort out pions which are less affected by absorption and rescattering even in a heavy collision system.
- Research Organization:
- Lawrence Berkeley Lab., CA (United States)
- OSTI ID:
- 64046
- Report Number(s):
- LBL--35984; CONF-9310315--; ON: DE95000804
- Country of Publication:
- United States
- Language:
- English
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